passthru.tests = {
      simple-execution = callPackage ./tests.nix { };
    };
  passthru.tests = {
      simple-execution = callPackage ./tests.nix { };
    };

{ runCommand, postrunner, stdenv }:

let
  inherit (postrunner) name;
  version = (import ./gemset.nix).postrunner.version;
in

runCommand "${name}-tests" { meta.timeout = 3; }
  ''
    # get version of installed program and compare with package version
    if [[ `${postrunner}/bin/postrunner version` != *"${version}"*  ]]; then
      echo "Error: program version does not match package version"
      exit 1
    fi
    # run help
    ${postrunner}/bin/postrunner --help | grep 'Usage postrunner .command. .options.'
    echo All test for $name passed
    # needed for Nix to register the command as successful
    touch $out
  ''

export NIXPKGS=$PWD # in my checkout of nixpkgs
nix-env -f $NIXPKGS -iA rubyPackages.postrunner
nix-build -A postrunner.tests # to run the tests
nix-build -A postrunner

cd pkgs/applications/misc/postrunner # in  my git checkout
nix-shell -p bundler zlib --run "bundle update postrunner"
nix-shell -p bundler zlib --run "bundix"
cd ../../../.. # get back to the root of my git checkout
nix-build $PWD -A postrunner.tests # to run the tests
nix-build $PWD -A postrunner
result/bin/postrunner --version # to check the output

cd /etc/nixos
nix flake update
sudo nixos-rebuild test --flake '.#librem'

nixops create -d nuc
cd /etc/nixos/hosts/nuc
nixops deploy -d nuc --test
# test the system and if everythins is okay install and reboot
nixops deploy -d nuc --boot
nixops deploy -d nuc --force-reboot

nuc> warning: unable to download 'https://cache.nixos.org/nix-cache-info': Couldn't resolve host name (6); retrying in 276 mss